package com.ye.controller;

import com.ye.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RequestMapping("/common")
@RestController
@Slf4j
public class CommonController {
    @Value("${ye.path}")
    private String basePath;


    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());
        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID生成文件名，防止文件名称重复造成文件覆盖
        String filename = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            //目录不存在，则需要创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(filename);
    }

/*    @GetMapping("/download")
    public void download( String name, HttpServletResponse response){

        try {
            //输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //通过输出流将文件写回浏览器，在浏览器显示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("images/jpeg");

            byte[] bytes = new byte[1024];
            int len = fileInputStream.read(bytes);
            while (len != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();


        } catch (Exception e) {
            e.printStackTrace();
        }

    }*/
    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
